Change displayname of a custom attribute

I added a custom attribute to change displayname.

public GridColumnAttribute(string DisplayName, string SummaryText, 
SummaryTypes SummaryType)
            {
                this.DisplayName = DisplayName;
                this.SummaryText = SummaryText;
                this.SummaryType = SummaryType;
            }

I used that display name in my business class.

MemberInfo property = 
typeof(MeterProfileCustomDTO).GetRuntimeProperty("ComsumptionPeriod01");
                        var attribute = 
property.GetCustomAttributes(typeof(GridColumnAttribute), 
true).Cast<GridColumnAttribute>().Single();
                        attribute.DisplayName = "Trial";

                        // Create a PropertyDescriptor for "SpouseName" by 
calling the static GetProperties on TypeDescriptor.
                        PropertyDescriptor descriptor = 
TypeDescriptor.GetProperties(periodItem.GetType())["ComsumptionPeriod01"];

                        // Fetch the ReadOnlyAttribute from the descriptor. 
                        GridColumnAttribute attrib = 
(GridColumnAttribute)descriptor.Attributes[typeof(GridColumnAttribute)];

                        // Get the internal isReadOnly field from the 
ReadOnlyAttribute using reflection. 
FieldInfo isReadOnly = attrib.GetType().GetField("DisplayName", 
BindingFlags.NonPublic | BindingFlags.Instance);

// Using Reflection, set the internal isReadOnly field. 
isReadOnly.SetValue(attrib, "2018-01");

I want to change this displayname at runtime. enter image description here